Commit d7bc63fa authored by Maulik Shah's avatar Maulik Shah Committed by Marc Zyngier

irqchip/qcom-pdc: Reset PDC interrupts during init

Kexec can directly boot into a new kernel without going to complete
reboot. This can leave the previous kernel's configuration for PDC
interrupts as is.

Clear previous kernel's configuration during init by setting interrupts
in enable bank to zero. The IRQs specified in qcom,pdc-ranges property
are the only ones that can be used by the new kernel so clear only those
IRQs. The remaining ones may be in use by a different kernel and should
not be set by new kernel.
Suggested-by: default avatarStephen Boyd <swboyd@chromium.org>
Signed-off-by: default avatarMaulik Shah <mkshah@codeaurora.org>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Tested-by: default avatarStephen Boyd <swboyd@chromium.org>
Reviewed-by: default avatarStephen Boyd <swboyd@chromium.org>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/1601267524-20199-7-git-send-email-mkshah@codeaurora.org
parent 299d7890
......@@ -341,7 +341,8 @@ static const struct irq_domain_ops qcom_pdc_gpio_ops = {
static int pdc_setup_pin_mapping(struct device_node *np)
{
int ret, n;
int ret, n, i;
u32 irq_index, reg_index, val;
n = of_property_count_elems_of_size(np, "qcom,pdc-ranges", sizeof(u32));
if (n <= 0 || n % 3)
......@@ -370,6 +371,14 @@ static int pdc_setup_pin_mapping(struct device_node *np)
&pdc_region[n].cnt);
if (ret)
return ret;
for (i = 0; i < pdc_region[n].cnt; i++) {
reg_index = (i + pdc_region[n].pin_base) >> 5;
irq_index = (i + pdc_region[n].pin_base) & 0x1f;
val = pdc_reg_read(IRQ_ENABLE_BANK, reg_index);
val &= ~BIT(irq_index);
pdc_reg_write(IRQ_ENABLE_BANK, reg_index, val);
}
}
return 0;
......
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